CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
ASSETS
Cash and cash equivalents	$ 36,776	$ 41,520
Short-term investments	22,201	39,412
Accounts receivable, net	8,257us-gaap_AccountsReceivableNetCurrent	8,238us-gaap_AccountsReceivableNetCurrent
Inventories	8,412us-gaap_InventoryNet	8,185us-gaap_InventoryNet
Prepaid expenses and other current assets	2,297	5,152
Total current assets	77,943us-gaap_AssetsCurrent	102,507us-gaap_AssetsCurrent
Property and equipment, net	8,708us-gaap_PropertyPlantAndEquipmentNet	9,683us-gaap_PropertyPlantAndEquipmentNet
Long-term investments	21,740	28,819
Other assets	498us-gaap_OtherAssetsNoncurrent	668us-gaap_OtherAssetsNoncurrent
Total assets	108,889us-gaap_Assets	141,677us-gaap_Assets
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	2,961us-gaap_AccountsPayableCurrent	4,870us-gaap_AccountsPayableCurrent
Accrued expenses and other liabilities	5,937us-gaap_AccruedLiabilitiesCurrent	4,444us-gaap_AccruedLiabilitiesCurrent
Deferred revenue	2,815us-gaap_DeferredRevenueCurrent	2,523us-gaap_DeferredRevenueCurrent
Total current liabilities	11,713us-gaap_LiabilitiesCurrent	11,837us-gaap_LiabilitiesCurrent
Income taxes payable	780us-gaap_AccruedIncomeTaxesNoncurrent	1,462us-gaap_AccruedIncomeTaxesNoncurrent
Total liabilities	12,493us-gaap_Liabilities	13,299us-gaap_Liabilities
Commitments and contingencies (Note 6)
Stockholders' equity:
Preferred stock: $0.001 par value authorized: 5,000,000 shares; issued and outstanding: none
Common Stock: $0.001 par value authorized: 150,000,000 shares; issued and outstanding: 23,128,372 and 27,561,482 shares, respectively	23us-gaap_CommonStockValue	28us-gaap_CommonStockValue
Additional paid-in capital	29,407us-gaap_AdditionalPaidInCapital	56,399us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive income	26	33
Retained earnings	66,940	71,918
Total stockholders' equity	96,396	128,378
Total liabilities and stockholders' equity	$ 108,889	$ 141,677

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(a))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682